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.IX Title "Lintian::Relation::Version 3"
.TH Lintian::Relation::Version 3 2024-02-05 "Lintian v2.117.0" "Debian Package Checker"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH NAME
Lintian::Relation::Version \- Comparison operators on Debian versions
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 6
\&    print encode_utf8("yes\en") if versions_equal(\*(Aq1.0\*(Aq, \*(Aq1.00\*(Aq);
\&    print encode_utf8("yes\en") if versions_gte(\*(Aq1.1\*(Aq, \*(Aq1.0\*(Aq);
\&    print encode_utf8("no\en") if versions_lte(\*(Aq1.1\*(Aq, \*(Aq1.0\*(Aq);
\&    print encode_utf8("yes\en") if versions_gt(\*(Aq1.1\*(Aq, \*(Aq1.0\*(Aq);
\&    print encode_utf8("no\en") if versions_lt(\*(Aq1.1\*(Aq, \*(Aq1.1\*(Aq);
\&    print encode_utf8("yes\en") if versions_compare(\*(Aq1.1\*(Aq, \*(Aq<=\*(Aq, \*(Aq1.1\*(Aq);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
This module provides five functions for comparing version numbers.  The
underlying implementation uses \f(CW\*(C`libapt\-pkg\-perl\*(C'\fR to ensure that
the results match what dpkg will expect.
.SH FUNCTIONS
.IX Header "FUNCTIONS"
.IP "versions_equal(A, B)" 4
.IX Item "versions_equal(A, B)"
Returns true if A is equal to B (\f(CW\*(C`=\*(C'\fR) and false otherwise.
.IP "versions_lte(A, B)" 4
.IX Item "versions_lte(A, B)"
Returns true if A is less than or equal (\f(CW\*(C`<=\*(C'\fR) to B and false
otherwise.
.IP "versions_gte(A, B)" 4
.IX Item "versions_gte(A, B)"
Returns true if A is greater than or equal (\f(CW\*(C`>=\*(C'\fR) to B and false
otherwise.
.IP "versions_lt(A, B)" 4
.IX Item "versions_lt(A, B)"
Returns true if A is less than (\f(CW\*(C`<<\*(C'\fR) B and false otherwise.
.IP "versions_gt(A, B)" 4
.IX Item "versions_gt(A, B)"
Returns true if A is greater than (\f(CW\*(C`>>\*(C'\fR) B and false otherwise.
.IP "versions_compare(A, OP, B)" 4
.IX Item "versions_compare(A, OP, B)"
Returns true if A OP B, where OP is one of \f(CW\*(C`=\*(C'\fR, \f(CW\*(C`<=\*(C'\fR, \f(CW\*(C`>=\*(C'\fR,
\&\f(CW\*(C`<<\*(C'\fR, or \f(CW\*(C`>>\*(C'\fR, and false otherwise.
.IP "versions_comparator (A, B)" 4
.IX Item "versions_comparator (A, B)"
Returns \-1, 0 or 1 if the version A is (respectively) less than, equal
to or greater than B.  This is useful for (e.g.) sorting a list of
versions:
.Sp
.Vb 3
\& foreach my $version (sort versions_comparator @versions) {
\&    ...
\& }
.Ve
.SH AUTHOR
.IX Header "AUTHOR"
Originally written by Russ Allbery <rra@debian.org> for Lintian and adapted
to use libapt-pkg-perl by Adam D. Barratt <adam@adam\-barratt\-org.uk>.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBlintian\fR\|(1)